To support with reasons, as a request.

To persuade by reasoning or argument; as, to reason one
into a belief; to reason one out of his plan.

To exercise the rational faculty; to deduce inferences from
premises; to perform the process of deduction or of induction; to
ratiocinate; to reach conclusions by a systematic comparison of facts.

To arrange and present the reasons for or against; to
examine or discuss by arguments; to debate or discuss; as, I reasoned
the matter with my friend.

Hence: To carry on a process of deduction or of induction,
in order to convince or to confute; to formulate and set forth
propositions and the inferences from them; to argue.

Ratio; proportion.

A thought or a consideration offered in support of a
determination or an opinion; a just ground for a conclusion or an
action; that which is offered or accepted as an explanation; the
efficient cause of an occurrence or a phenomenon; a motive for an
action or a determination; proof, more or less decisive, for an opinion
or a conclusion; principle; efficient cause; final cause; ground of
argument.

i. neden, sebep. What’s the reason of this delay? (Bu gecikmenin nedeni nedir?)

Due exercise of the reasoning faculty; accordance with, or
that which is accordant with and ratified by, the mind rightly
exercised; right intellectual judgment; clear and fair deductions from
true principles; that which is dictated or supported by the common
sense of mankind; right conduct; right; propriety; justice.

To converse; to compare opinions.